Method for purifying liquid hydrocarbon motor fuels from sulfur and for further reducing the sulfur dioxide content in exhaust gases up to zero during combustion of the fuels

Abstract

The invention relates to the oil-refining industry, in particular, to methods for purifying a fuel from sulfur-containing compounds, by separating the sulfur-containing modified molecules from the remainder of the fuel molecules on polymer membranes and by activating the fuel purified in the fully-developed cavitation mode prior to the combustion. The reduction of the sulfur content in the fuel is achieved by treating the fuel or a fuel fraction in the fully-developed cavitation mode with addition of a hydrogen peroxide aqueous solution and/or a strong aqueous solution of iron oxides, followed by separating the obtained emulsion into a fuel fraction and a water-paraffin emulsion, followed by separating the fuel fraction on the membranes under the temperature of from 90° C. to 180° C. under atmospheric pressure into a fuel fraction having low sulfur combustion of the purified fuels down to zero by means of activation of the fuels having the low sulfur content.

The invention claimed is: 
     
       1. A method for purifying liquid hydrocarbon motor fuels by reduction of a sulfur content and for further reducing a sulfur dioxide content in exhaust gases down to zero during combustion of the fuels by means of chemical transformation of sulfur-containing molecules of the fuels in a fully-developed cavitation mode, physical separation of modified sulfur-containing molecules from the remainder of the molecules on membranes followed by activation of the fuels in the fully-developed cavitation mode prior to the combustion, characterized in that the reduction of the sulfur content in the fuel comprises the steps of:
 treating the fuel or fuel fraction in the fully-developed cavitation mode with addition, to the fuel, of a hydrogen peroxide aqueous solution in the amount of 1-10 ml of the hydrogen peroxide per 1 liter of the fuel and/or an aqueous solution of iron oxides in the amount of 0.5%-20% of the fuel volume, followed by; 
 separating an obtained emulsion into a fuel fraction and a water-paraffin emulsion, and followed by; 
 separating the fuel fraction on the membranes under a temperature of from 90° C. to 180° C. under the atmospheric pressure into a fuel fraction having a low sulfur content of up to 20 ppm and into a fuel fraction having an increased sulfur content, including reduction of the sulfur dioxide content down to zero in the exhaust gases by means of activation prior to the combustion of the fuel fraction having the low sulfur content in the fully-developed cavitation mode without addition of other chemical substances, production of a reduced oil-water emulsion from the water-paraffin emulsion and the fuel fraction having the increased sulfur content for combustion in boiler units. 
 
     
     
       2. The method of  claim 1 , characterized in that wastes, which must be disinfected or stacked, are not formed during the method of purifying the fuels.